Which Primetime Sweetheart Shared This Bikini Shot From Paradise?

Whose Rear View Is This?

Whoa. We see a lot of celeb bikini pics, but few snapshots are as, um, candid as this one — arms outstretched, tippy toes, and one of the fittest bums in the biz. This starlet tweeted the photo from a July vacation in Cabo San Lucas.

Who is it? We’ll give you some hints. She can be found on a current primetime fifth season show. While her TV character is now super stylish, it wasn’t always that way: When we first met her character, her outfits were more knee socks and plaid skirts than figure-flattering minis. When this TV star’s not reciting lines, she’s tweeting about hitting the gym, singing in the studio, and inspiring fans with her strength.